Agear set uses of an 18-tooth pinion, has a diametral pitch of 8 teeth in and a pressure angle of ? -20 . the pinion runs at 750 rev/min and drives a gear at a speed of 500 rev/min. (a) find the number of teeth required on the gear. (b) what is the theoretical center-to-center distance of the shafts?

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?